I am looking for some advice on an upcoming event for me where it is fairly important I am dressed well.

Just to put it into context and very good friend of mine from way back is having a party thrown for him by some new friends consisting of a group of very well dressed law students and alumni of a similar area. I have been invited and the dress code simply reads: Ties are a must. I shouldn't imagine a full suit will be necessary, however, I'd quite like to sport a blazer. What I am asking is; what colour and style of blazer will be acceptable with which shirt, tie and trouser combination (I aim to wear a tassled loafer of some sort, probably black leather) in order to make a stylish impact without standing out too much?

I accept this is a lot to ask but any advice would be much appreciated.